Length-Scale-Dependent Micromechanical Modeling for Precipitate Hardening in Inconel 718 Superalloy

Abstract:

In this paper, a micromechanical finite element (FE) model has been proposed to investigate the effect of the nanoscale precipitates on the development of microplasticity for Inconel 718 (IN718) superalloy. A strain gradient crystal plasticity formulation has been developed with the considerations of the evolution of statistically stored dislocation density and geometrically necessary dislocation density. The mesh convergence has been examined, showing that sufficiently fine mesh is required in the FE model. The results show that the model with strain gradient effect incorporated shows less peak plastic strain and higher value of dislocation density than the model with no strain gradient effect. The present study indicates that the strain hardening process at the scale of strengthening precipitate is mainly governed by the evolution of geometrically necessary dislocation densities.

• Periodical: Solid State Phenomena (Volume 315)
• Pages: 84-89
• DOI: https://doi.org/10.4028/www.scientific.net/SSP.315.84
• Online since: March 2021
• Authors: Chang Feng Wan*, Dong Feng Li, Hai Long Qin, Ji Zhang, Zhongnan Bi
• Keywords: Crystal Plasticity, Dislocation-Based Hardening, IN718 Superalloy, Size Effect, Strain Gradient

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